Paper pattern indicated loom dobby



Dec. 15,1942. R. G. TURNER PAPER PATTERN INDICATED LOOM DOBBY Filed May 4, 1942 2 Sheets-Sheet 1 FIG. 1

INVENTOR 'Pucumao G.TURNER HT TORN ELY Dec. 15, 1942.

R. G. TURNER PAPER PATTERN INDICATED LOOM DOBBY 2 Sheets-Sheet 2 Filed May 4, 1942 I TIIIIIIIIIIIIIIIII:

71/11/1111 IiiVIIII/IIIA FIE-5' FIE- INVENTQR RLQHARD 6. RN-ER Patented Dec. 15, 1 942 PAPER PATTERN INDICATED, LOOMDOBBY Richard G. Turner, Worcester, Mass., assignor to Crompton & Knowles Loom Works, Worcester, Mass, a corporation of Massachusetts Application May 4, 1942, Serial "No. 441,629

13 Claims. (Cl. 139-68) This invention relates to improvements in loom dobbies and it is the general object of the invention to provide a dobby of the usual form operating with a paper pattern having perforated and unperforated portions which determine the pattern of the fabric being woven.

The usual dobby comprises a set of vertically movable fingers which act to determine the position of lifter hooks with respect to lifter knives. The hooks are customarily above the knives and tend to fall to a normal position in the path of the knives, but are raised when the fingers are lifted by pegs on the dobby chain. It is an important object of my present invention to provide a set of pattern reading and hook'setting members controlled by a paper pattern and operating to transmit lifting forces for the hooks through perforations in the sheet pattern.

In my co-pending application Serial No. 402,080 I have set forth a paper pattern indicateddobby wherein the hooks are below the knives and nor mally out of the path of the latter. The relationship between the knives and the hooks shown in that application is the reverse of the conditions ordinarily found in dobbies and it is a purpose of the present invention to adopt the mecha, nism shown in the aforesaid application to the usual type of dobby wherein the hooks fall to indicating position by gravity and are positively lifted out of indicating position against gravity by the aforesaid pattern reading and hook setting members.

In double index dobbies it is customary to I move the indication for two successive picks into control or pattern reading position at the same time. The indications for one of the set of hooks is immediately usable because of the fact that the corresponding knife is temporarily disengaged from the hooks. The indication for the other set of hooks, however, is not immediately elfec-.

tive with respect to such hooks as are momentarily engaged with their corresponding knife which at that time is at the end of its working stroke. With respect to this latter set of hooks,

the indications do not become available untilthe second pick, but are retained and delivered ment of parts hereinafter described and set forth. 7

In the accompanying drawings wherein a convenient embodiment of my invention is set forth,

" on a return stroke.

Fig. l is a front elevation of a loom dobby having my invention applied thereto,

Fig. 2 is an enlarged front elevation of one of thehooks used with my invention showing the lifter wire and knife therefor when the hook is indicated for movement by its knife,

.Fig. 3 is a plan view of Fig. 2,

Fig; 4 shows a portion of the paper or sheet pattern used with my invention,

'Fig. 5 is an end elevation of the dobby looking in the direction of arrow 5, Fig. 1,

- Fig. 6 indicates the hook in lowest position resting on its lifter wire in dotted lines, and in position preparatory to movement by its knife in. full lines, and

Fig. 7 is an enlarged vertical section through the carrier for the reading and setting spring plungers.

Referring to Figs. 1 and 5, I have shown a loom frame In on which is mounted the dobby D having across rod I I affording a pivotal support for the harness lifting jacks I2. thereto a jack lever I3 provided with upper and lower hooks I4 and I5, respectively, to cooperate with top and bottom knives I6 and I1, respectively. The right hand position of the jack levers, Fig.1, is determined by girts I8 extending between and secured to the front and back plates I9 and 20, respectively, of the dobby.

A rock shaft 2I is journaled on the plates I9 and and has the forward end thereof secured to a lever 22 having a link 23 for the forward end of top knife I6 and a second link 24 for the forward end of bottom knife II. The rear end of shaft 2| has secured thereto a three-arm lever 25 connected by link 26 to the rear end of top knife I6 and similarly connected by link 21 to the rear end of bottom knife IT. The third arm 30 of lever 25 is connected to a descending rod 3| having a two-pick cycle of movements imparted to it by a regularly moving part of the loom. Rod 3| rises on one pick of the loom to move bottom knife I! to the left, Fig. l, on a working stroke and simultaneously move top knife IE to the right On the next pick rod 3| descends and movement of the knives is reversed. The matter thus far described is of usual construction except for the form of the lifter hooks I4 and. I5.

group of wires 31 as seen in Fig. 1 are vertically movable to determine the position of their cor- Each jack has pivoted I responding top hooks l4, while wires 38 are similarly vertically movable to determine the position of the bottom hooks l5. A fixed guide frame 40 is secured to the front and back plates of the dobby and extends horizontally under the dobby frame and has a plate 41 perforated to receive the lower ends of the wires 31 and 38. Frame 48 has top and bottom plates 42 and 43, respectively, below plate 4|, plate 42 being perforated to receive the lower ends of the wires 31 and 38 and plate 43 having perforations 44 registering with the lower ends of the lifter Wires.

An endless or sheet paper pattern 1? passes between the plates 42 and 43 and is moved in the direction of arrow at, Fig. l by means of a cylinder 58 journaled for rotation on small bearings secured to and depending from the front and back dobby side plates. The cylinder 50 is mounted on and secured to a shaft 52 the rear end of which is secured to a worm gear 53 mesh-' ing with a worm wheel 54 secured to a shaft 55 extendinghorizontally behind the dobby. Shaft 55 is mounted for rotation in arms 56 secured to therear dobby plate and has secured thereto a sprocket wheel 51 around which is trained a chain 58. The latter is driven by some part of the loom to rotate shaft 55 one revolution every second pick of the loom and the worm and worm gear cause an advance feeding step-by-step movement of the pattern surface P every second pick of the loom.

A bracket 60 secured to and hanging downwardly from the dobby side plates has pivoted thereon at 6| front and back levers 62 and 63, respectively. Each lever has a short arm 64 connected to a horizontal rod 55 which causes the two levers torock in unison and in the same direction. Front and back vertical rods 66 and 61 are connected to the front and back levers, respectively, at their lower ends and at their upper ends are pivoted to ears 68 and 69 secured to and extending respectively forwardly from and behind a carrier 10. Guide posts H are secured to the dobby frame and pass through the ears 58 and 59 to guide the carrier in its vertical movement.

A cam 15 is secured to shaft 55 and has a cam groove 16 to cooperate with a cam roll TI on the rear lever 63. The cam turns in the direction of arrow 1), Fig. 5, and causes rocking of the levers 62 and 6.3 to raise the carrier if! every second pick of the loom preferably at the, time in the cycle of the loom when the bottom knife I! is atthe end of its return stroke and in the position shown in Fig. 1.

The carrier may conveniently be made of sheet metal as shown in Fig. '7 and has a vertical wall 80 from which extends horizontal top and bottom flanges BI and 82, respectively. The carrier has mounted thereon two rows of pattern reading and hook setting members each comprising a vertical rod 85 the upper end of which slides through a perforation 85 in the top flange 8| and registering with a perforation 44 in plate 43. A shoulder 81 limits upward movement of the plunger under the action of a compression spring iifi surrounding the lower part of the plunger and located between a shoulder 89 and the bottom flange 82. Each spring 88 is preferably strong, enough to lift one of the lifter wires and its corresponding hook without yielding, but can be compressed by an unperforated portion of the pattern P.

In Fig. 4 I show a form of pattern comprising an endless sheet 95 having perforated and unper- 76 forated portions 9| and 92, respectively, which are preferably arranged in pairs of transverse rows. In Fig. 4, for instance, pairs C of indications are located between lines d and the feed of the worm and worm wheel for the cylinder is such that every second pick of the loom a new pair of indications of the sheet pattern will move to reading position between the plates 42 and 43 to register with the several plungers 85 on the carrier 10.

In operation, whenthe sheet pattern has come to rest the cam raises the carrier and any plungers which align with erforations 9| pass through the sheet pattern to engage the lifter wires aligned with them to cause lifting of the corresponding hooks from their normal down position to a non-indicating position above the associated knives. If, on the other hand, an unperforated portion 92 of the sheet pattern registers with a plunger the spring of the latter will becompressed and the lifter wire and hook corresponding-thereto will remain down in indicatedposi-tion in the path of the associated knife.

The dobby set forth herein is of the so-called double index type, the row of plungers 85 at the right as shown in Figs. 1 and '7 operating during the first pick of the pair of picks following movement of a row 0 to reading position to position the bottom hooks and the left hand row of plungers 85 being effective to complete their indication for the top hooks during the second pick of the pair of picks. 'It is to be understood that when the-carrier I0 rises the plungers B5 of both rows which pass through perforations 9| will transmit lifting. forces to their respectivewires 31 and hooks 38. On this pick of the loom the top knife will ordinarily be at the end of its working stroke and will have a sufficient hold on the previously indicated hooks M to prevent the latter from rising until the; topknife reaches'the, end of its return stroke. The plungers for the left hand row alignedwith perforations will therefore be prevented from rising to lift their hooks out of the path of-knife 16 until the latter completes its return stroke. The springs 88 of such plungers will be-compressed' during the first pick of the pair of picks and will act during the second pick to raise their hooks.

Figs. 2'and 6 show the relation between a hook in indicated position, its lifter wire and the corresponding knife. The conditions are the same for both top and bottom hooks, but I will describe the top knife only. When an unperforated part 'of-the sheet pattern holds a plunger 85 down the corresponding lifter wire 31 is in low position and the associated hook l4 will rest on its wire when the knife therefor is to the left, Fig. 1, as shown in dottedlines, Fig. 6. As the knife returns itWiIlengagethe under inclined surface of the hook head 94 and raise the latter. When the knifenears the end of its return stroke the hook head 9| will fall to the left of the knife to the fulllline' position of Fig. 6, and as shown in Fig 2." In this position the bottom edge 96 of the hook is above the'lifterwire and the latter will not be'engaged by the hook when it is moved by-the knife. 7 On its return stroke'knife l6 strikes surface 95 ata point abovebottom'edge 96', hence the hook falls back a. less distance than it is raised and for'this reason clears its lifter wire. The lifter wire is therefore not subject to wear as in'previ'ous dobbies.

From the foregoing it will be seen that I have provided a simple form of pattern controlled dobbywhereinthe hooksare normally down in the path of the lifter knives and'are raised to non-indicating position when perforated portions of the sheet pattern registers with the corresponding lifter plungers 85. This relationship is the reverse of that setforth in my previously mentioned application, and the pattern sheet set forth herein will be the reverse so far as perforated and unperforated portions are concerned from the sheet pattern shown in said application in order to effect the same control for the hooks. It will also be seen that wearing of the lifter wires is prevented by the relation shown in Figs. 2 and 6. Furthermore, the invention is adaptable to double index dobbies due to compressibility of the springs 88.

Having thus described my invention it will be seen that changes and modifications may be made therein by those skilled in the art without departing from the spirit and scope of the invention and I do not wish to be limited to the details herein disclosed, butrwhat I claim is:

1. In a loom dobby having a harness lifter knife moving along a given path, a harness lifter hook normally in said given path, two hook positioning members one of which is movable by the other to lift said hook out of said ath, a sheet pattern located between said members and having perforated and unperforated portions, feeding mechanism to move the perforated and unperforated portions progressively to controlling position between said members, and means to cause said members to lift the hook out of said given path by a force transmitted through a per-- forated portion of said sheet which is in controlling position between said members, an unperforated portion of the sheet pattern in controlling position between said members preventing said means from causing said members to move the hook out of said path.

2. In a loom dobby having a lifter knife moving along a given path, a harness lifter hook normally in said given path, a sheet pattern below said hook and having perforated and unperforated portions, mechanism to feed said sheet pat tern to move the perforated and unperforated portions thereof progressively to reading position, hook positioning means including two parts accessible to each other for mutual engagement 7 through a perforated portion of the sheet pattern in reading position, one part being on one side of the sheet pattern and the other part on the opposite side of the sheet pattern between the latter and said hook and movable to remove the hook from said given path, an unperforated portion of the sheet pattern in reading position preventing mutual engagement of said parts, and means to cause said parts when in mutual engagement to communicate a force from said one part through a perforated portion of the sheet pattern to said other part and from the latter to said hook to move the latter out of said given path.

3. In a loom dobby having a lifter knife reciprocating along a given path and having a harness lifter hook normally in said path and a positioner for said hook movable to remove the hook from said path, a sheet pattern having perforated and unperforated portions and located on said one side of the given path with the positioner between said hook and the sheet pattern, mechanism to feed the sheet pattern to place the perforated and unperforated portions thereof progressively in leading position, and means operating from that side of the sheet pattern opposite said path and aligned with the positioner and that portion of the sheet pattern in reading position to transmit a force through the perforated portions of the sheet pattern in reading position and communicate said force to the positioner to cause the latter to move the hook out of said given path, the unperforated portions of the sheet pattern preventing operation of said means to move the positioner and permitting the hook to remain in said given path.

4. In a loom dobby having a lifter knife reciprocating in a given path, a harness lifting hook normally in said given path, a sheet pattern having perforated and unperforated portions, a pair of aligned members, one on each side of said sheet pattern, one of said members being on that side of the sheet between the latter and said hook and movable against the hook to move the same out of said path, actuator means to move the other member toward the first member from that side of the sheet pattern opposite the first member, a resilient connection between said actuator and said other member, the latter movable relatively to the actuator means against the action of said resilient connection, and feeding mechanism to move the sheet pattern relatively to said members to place both perforated and unperforated portions of said sheet pattern progressively between said members, said actuator means operating to move said other member through perforated portions of the sheet pattern into engagement with the first member and causing the resilient connection to move said first member by a force derived from the actuator means and transmitted through said other member to remove the hook from said given path, and said resilient connection being caused to yield to permit relative motion of the actuator means with respect to said other member when the latter engages an unperforated portion of the sheet pattern to prevent said other member from engaging the first member and thereby permit the hook to remain in said given path.

5. In a loom dobby having a lifter knife moving along a given path and having a harness lifter hook normally in said path and a hook positioner for said hook to move the latter out of said given path, a sheet pattern on one side of said path and positioner and having perforated and unperforated portions, feeding mechanism to move the perforated and unperforated portions of said sheet pattern progressively to reading position, a positioner moving member located on that'side of the sheet pattern opposite the path and aligned with the positioner, actuating means to cause said member to exert a given moving force from said other side of the sheet pattern transversely of the latter toward the positioner sufliciently strong to move the positioner and cause the latter to remove the hook from said given path, an unperforated portion of the sheet in reading position being capable of withstanding said given force to prevent engagement of the member with the positioner, the member when aligned with a perforated portion of the sheet pattern in reading position and moved toward the latter by said actuating means transmitting the said given force through said perforated portion and against the positioner to cause the latter to move the hook out of said given path. 7

6. In a loom dobby provided with a reciprocating knife having working and return strokes along a given path, a harness controlling hook normally in said given path and having a head to be engaged by the knife on a working stroke of the latter to move. said hook, a sheet pattern havinga perforation therein, a pattern reading and hook setting member, a carriage for the member, spring. means located between the member and the carriage, means tomove the carriage and member toward the sheet pattern to move the member through the perforation prior to arrival of the knife to the end of the return stroke, and means moved by the, reading and setting member when the latter passes through the perforation tending to move the hook away from said knife, the engagement between the knife and the head of the hook resisting the-last named movement and causing deformation of the spring and the latter acting to move the hook out of said path when the knife completes the return stroke thereof and moves out of holding engagement with respect to the hook.

'7. In a loom dobby having a lifter knife having working and return strokes along a given path and having a harness lifter hook normally in said path, the knife and hook being out of holding engagement with respect to each other at the beginning of a working stroke and at the end of a return stroke and the hook when engaged with the knife on a working stroke of the latter resisting movement away from said knife and out of said path, a sheet patternhaving a perforationtherein, a pair of cooperating hook moving members, one of said members being located between the sheet pattern and the hook and the other member being on that side of the sheet pattern opposite the first member, yielding means to move said other member through the perforation into engagement with said one member to move the latter against said hook while the latter has holding engagement with the knife on a working stroke of the latter, said hook when disengaged from the knife upon completion of a return stroke of the latter being moved out of said path by a force-originating with said yielding means and transmitted through said member.

8. In a double index loom dobby having spaced oppositely reciprocating top and bottom harness lifter knives moving along given paths and having a harness jack lever provided with top and bottom hooks normally out of the path of their respective knives and each hook having a litter movable to locate the corresponding hook out of the path of the associated knife, each knife requiring one pick for a working stroke and a second pick for the return stroke thereof, a sheet pattern having perforated and unperforated portions arranged in pairs of parallel rows extending transversel across the sheet pattern, means to advance the pattern sheet every second pick of the loom to locate a pair of rows in reading position, one row in reading position being for the lifters of the top hooks and the other row being for the lifters of the bottom hooks, a set of pattern reading members under each sheet pattern row in reading position, a carriage for said sets of members, a resilient element between each member and the carriage deformable to permit relative motion of the associated member with respect to the carriage in a direction away from the sheet pattern, and means to move the carriage toward the sheet pattern at two-pick intervals while a pair of sheet pattern rows is in reading position, the members aligned with perforated portions in both rows of the sheet pattern passing through said perforations and transmitting forces to the corresponding lifters tending to cause the latter to set their respective hooks out of the paths of. their knives, unperforated portions of the sheet pattern aligned with other members causing "deformation ofI-the resilient elements associated with the latter members to permit the associated hooks to remain in the paths of their respective knives.

9.. In a double index loom dobby having top and bottom oppositely reciprocating harness lifter knives each of which has a. working stroke and areturn stroke, each knife requiring' two successive picks of. the loom to complete successive working and return strokes, the dobby having a harness jack lever provided with top and bottom hooks normally out of the path of their respective knives, a lifter for eachhook, each lifter movable to locate the correspondinghook out of the path of the associated knife, a sheet pattern having pairs of perforated and unperforated portions movable progressively to reading position and aligned with said lifters when the sheet pattern is stationary, a. pair of pattern reading members aligned with that part of the sheet pattern in reading position, one member aligned with each of said lifters, said members located on that side of the sheet pattern opposite the lifters, a carriage for the memb rs movable from inoperative position toward the sheet pattern to operative position, a resilient element between the carriage and each member deformable to permit motion of the associated member with respect to the carriage in a direction, away from the sheet pattern, and means to move the carriage to operative position at regularly recurring two-pick intervals to move the members to reading position with respect to that part of the sheet pattern in reading position and maintainsaid carriage in operative position for an interval of more than one pick of the. loom, either member whenaligned with a perforated part of .the sheet pattern pa sing therethrough and moving the associated lifter when the carriage moves to operative position to locate the corresponding hook out of. the path of the knife associated therewith, an unperforated portion of the pattern causing motion of a member aligned therewith in a direction relatively to the carriage away from the sheet to deform. the corresponding resilient element and prevent actuation of the associated lifter and permit the corresponding hook to remain in the path of the associated knife.

10. In a loom dobby operating with a knife having a working stroke along a given path, a lifter hook to be located either in or out of said path,-a lifter for the hook having low and high positions, and means to support the lifter in low position, said lifter when in low-position supporting the hook in said path in low position and said lifter when in high position holding the hook in high position out of said path, and the knife when engaging the hook on a working stroke supporting said hook in an intermediate position between said high and low positions and out of engagement withsaid lifter when the knife is at the start of the working stroke thereof.

11. In a loom dobby operating with alifter knife having. a working stroke along a given path, a. lifter hook to have low and intermediate positions in said path and a high position out of said path, and a lifter to support said hook in the low and high positions thereof when the knife isaway from, said. vhook on a working stroke, andsai-d knife when engaging the hook atQthebegi-nning on a working. stroke holding said hook at the intermediate position thereof above and out of contact with said lifter.

12. In a loom dobby operating with a lifter knife having working and return strokes along a given path, a lifter hook for the knife, and a lifter for said hook to support the latter in a low position in said path when the knife is at the end of a working stroke thereof and also support said hook in high position out of said path, the knife on the return stroke thereof lifting the hook from the low position thereof and supporting said hook in an intermediate position between said low and high positions and out of contact with said lifter.

13. In a loom dobby operating with a lifter knife having working and return strokes along a given path, a lifter hook for the knife, a head on said hook having an inclined under surface for engagement with the knife, and a lifter for the hook, said lifter capable of having two positions in one of which said lifter supports the hook in low position with said inclined surface in a path of the return stroke of the knife, and said lifter when in the other position maintaining the hook out of said path, the knife on the return stroke engaging said inclined surface to lift the hook and pass beyond said head, whereupon said hook falls on and is supported by the knife in an intermediate position between the high and low positions determined by said lifter and out of engagement with the latter when the knife is at the beginning of the working stroke thereof.

RICHARD G. TURNER. 

